Gas-heater tor  water-backs



H. H. EWAN.

GAS HEATER FOR WATER BACKS. APPLICATION FILED mm. 20. m1. RENEWED JULY 1|. \9'19.

1,314,860. Patented Se t. 2, 1919.

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HORACE H. EWAN, or ,IBALIIMORE, MARYLAND.

GAS-HEATER FOR WATER-BACKS.

Specification of Letters Patent.

Patented Sept. 2, 1919.

Application filed March 20, 1917, Serial No. 156,109. Renewed July ll, 1919. Serial No. 310,207.

' the following is a specification.

This invention relates to portable or detachable gas heaters for the waterbacks of cooking stoves and ranges, and its object is to provide a simple and eificientdevice of this character which may be used for cooking as wellas for water heating.

In order that'the invention may be readily understood, reference is had to the accompanying drawings, forming apart of this specification, and in which,

Figurel is a partial front elevation of an ordinary stove or range, showing how the gas is supplied to my improved burner;

Fig. 2 is a vertical section through the firebox of such a stove showing the waterback, and my improved burner in operative position with respect thereto;

Fig. 3 is a rear sectional elevation of my improved burner on an enlarged scale; and,

Fig. 4 is a detail showing one of the spacing screws which I employ.

Referring to the drawings in detail, 1 designates the usual waterback which is located in the firebox of the stove, and connected with a suitable tank or boiler (not.shown) by means of the usual pipes 2. 3 designates the grate, and 4 the ashpit door, both of which are of the usual or any desired construction. 5 indicates the oven and 6 the plate or cooking surface of the stove. At 6 is illustrated the usual smoke flue.

My improved burner consists of a box or casing 7, preferably made of cast iron, and rectangular in form, as clearly shown in the drawing. The burner is relatively long and narrow and rests upon the grate 3 with one of its longitudinal side faces in close proximity to the inside wall of the waterback 1. In the side face of the burner adjacent the waterback are formed a plurality of relatively small holes 8, such holes being preferably disposed in horizontal rows and arranged in staggered relation, as shown in Fig. 3. A plurality of spacing screws 9 are set into the front wall of the burner and abut against the adjacent wall of the waterback, thus properly spacing the burner from the waterback. The distance between the burner and waterback may beadjusted, as deslred, by screwing these screws in or out.

The gas is supplied to the burner through a pipe 10, which taps'the burner adjacent oncend at the rear where there is preferably formed a; boss 7, to receive the pipe. A suitable air and gas mixing device is prov ded and may be of any desired construction. As shown, in Fig.3, it consists of a cap 11 screw-threaded on to the end of pipe 10 and rovided with a number of holes 12. A relatively small nipple 13 is screwed into the center of the cap 11 and is connected by means of a couplingl l with a pipe 15, to the end of which a hose16 is attached. This hose 16 is led out through a draft opening in the ashpit door 4., asshownin Fig. 1, or through some other door, so as to avoid making any special opening in the stove casing to accommodate it. This is facilitated "by bringing the pipe 15 down through the grate, as shown in Fig. 2, into the ashpit.

Gas entering the pipe 15 discharges in the form of a jet through the nipple 13, and, drawing air in through the holes 12, the mixture of gas and air passing through the pipe into the interior of the burner, whence it issues through the jet openings 8. When the flame is ignited, these jets impinge against the surface of the Waterback 1 and produce an intense heat. The length of the jets may be regulated by means of the screws 9, as described, in accordance with the gas pressure being used.

It will be observedthat the jets issuing from the face of the burner and impinging upon the waterback form practically a continuous sheet of flame, and that no air, other than that already mixed with the gas, is admitted to the space between the burner and water-back, except at the edges. The flame and heated products of combustion pass upwardly along the waterback and impinge against the plate 6, whence they pass rearwardly into the flue 6.

Although the heat thus generated is sufiicient in many instances for cooking on the plate 6, I prefer to provide means for producing an additional supply of heat under this plate, as shown in the drawings. This means consists of a pair of tubes 18, set in bosses 17, formed on the top of the burner and communicating with the interior thereof. It will be evident that these tubes are slightly inclined rearwardly, as shown,

so as to directithe flame to. the proper point.

At the top of each tube 18 is mounted a cap 19, rotatable on the tube and provided With a handle 20, by means of Which it may be conveniently turned. The end of the tube is provided ith radial openings 22, and the cap has similar openings 21, the arrangementbeingsuch that the openings 21- 22 may bebrought into and outro r gi t y y turning the cap, as will be evident. From the above it Will be seen that themixture or, gas and air from the interior ,of ,.the burner 7 passes upwardly through the tubes 18" :and issues from the openings 21 in the formofjetsi When ignited, these jetspro; duce a powerful heat under the cooking surface 6' of the'stove, 1

It will be noted that my iinproved burners -1. A gas heater for the vvaterbaoks of stoves and the like comprising-a rectangular burner box having a, continuous unbroken face adapted tobe disposed adjacentto and parallel With a all ofthe Waterback, said face being provided with jet openings, 7

Coniis b: this patent mayb ab ein dfqr fiv cen ch,fby 'addr ssingltlie "f i mmis bnen 0111 Pat nts;

rim of said burner box.

signature. 7

parallelrwith a Wall of the aterback, said face being provided With jet openings, adjustable spacing screws set into such face for regulating the distance between ,the same and the Waterbaok, and means for sup? plyinga mixture of air and gas to the inte- In a gas heaterfor thervvaterbacks of stoves and the like, a burner comprising'a box havingone face adapted to be disposed adJacent the Waterback and provided With- .flowof gas from said, last-named jet open ings. a r In testimony whereof have affixed my noniionn. EWAN;

as ingtonan-fl-v jet openings,.meansfor supplying. gasto said box, a pipe projecting up from said 

